--- a/app.py
+++ b/app.py
@@ -1,2 +1,5 @@
+def normalize_sku(value):
+    return value.strip().lower()
+
 def clean(value):
-    return value.strip().lower()
+    return normalize_sku(value)
--- a/consumer.py
+++ b/consumer.py
@@ -1,4 +1,4 @@
-from app import clean
+from app import normalize_sku
 
 def label(value):
-    return 'sku:' + clean(value)
+    return 'sku:' + normalize_sku(value)